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In which pair of ions both the species contain S – S bond?
Explanation
S–S bonds occur in thiosulphate and tetrathionate.
Detailed Solution
Tetrathionate $S_4O_6^{2-}$ has S–S–S–S linkage and thiosulphate $S_2O_3^{2-}$ has an S–S bond, whereas $S_2O_7^{2-}$ and $S_2O_8^{2-}$ have S–O–S and S–O–O–S linkages.